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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.56  No.2 (2015)  >  pp.269-273

MATERIALS TRANSACTIONS
<<Previous article Vol.56  No.2 (2015)   pp.269 - 273 Next article>>

Damage Evaluation in Lithium Cobalt Oxide/Carbon Electrodes of Secondary Battery by Acoustic Emission Monitoring

Chan-Yang Choe1), Woo-Sang Jung2), Jai-Won Byeon1)
1) Department of Materials Science and Engineering, Seoul National University of Science and Technology 2) High Temperature Energy Materials Research Center, Korea Institute of Science and Technology

Acoustic Emission (AE) technique was employed for evaluating charge/discharge damage in a lithium-ion battery. A coin-type battery of lithium cobalt oxide/carbon electrodes was used for acoustic monitoring during accelerated charge/discharge cycle test. A number of AE signals were successfully detected during charge/discharge. Microstructural observation of the electrodes after the cycle test revealed mechanical damage such as micro-cracking of the cathode and chemical damage such as solid electrolyte interphase (SEI) layer formed on the anode. The detected AE signals were classified into two distinct types (i.e., type 1 and type 2) based on the AE waveform parameters (i.e., duration and amplitude). The main frequency component of the type 1 signal with short duration and high amplitude was in the range of 121–160 kHz, whereas the frequency of type 2 signals with long duration and low amplitude was between 81 and 120 kHz. Active AE source of type 1 and type 2 signal was attributed to micro-cracking in cathode and gas bubble accompanied by SEI layer formation on anode, respectively. These results demonstrate the feasibility of the AE technique for the evaluation of charge/discharge degradation of secondary battery.


Keyword:
acoustic emission, lithium-ion battery, in-situ evaluation, degradation, micro-crack

Received: November 07, 2014
Accepted: December 03, 2014 , Published online: January 25, 2015

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